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Borrowings (Schedule of Amounts Outstanding and Interest Rates of Short-term Borrowings) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]      
Balance outstanding at end of year $ 445,921,000us-gaap_ShortTermBorrowings $ 398,932,000us-gaap_ShortTermBorrowings $ 192,681,000us-gaap_ShortTermBorrowings
Average daily balance outstanding 417,585,000us-gaap_ShorttermDebtAverageOutstandingAmount 271,281,000us-gaap_ShorttermDebtAverageOutstandingAmount 261,335,000us-gaap_ShorttermDebtAverageOutstandingAmount
Maximum balance outstanding at any month end $ 467,811,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod $ 398,932,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod $ 346,786,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
Weighted average interest rate for the year 0.19%us-gaap_ShortTermDebtWeightedAverageInterestRate 0.19%us-gaap_ShortTermDebtWeightedAverageInterestRate 0.21%us-gaap_ShortTermDebtWeightedAverageInterestRate
Weighted average interest rate at end of year 0.20%cac_ShortTermDebtWeightedAverageInterestRateForEndOfYear 0.16%cac_ShortTermDebtWeightedAverageInterestRateForEndOfYear 0.18%cac_ShortTermDebtWeightedAverageInterestRateForEndOfYear